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Lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material, preparation method thereof and lithium ion battery

A composite cathode material, lithium cobalt iron phosphate technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of long production cycle, high production cost, and difficult to control the bonding between carbon elements and lithium iron phosphate particles. , to achieve the effect of fast reaction speed, good consistency and speeding up the growth rate of spheroids

Inactive Publication Date: 2016-12-21
郑州百成新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, the combination of carbon elements and lithium iron phosphate particles is not easy to control, and has the disadvantages of long production cycle and high production cost.

Method used

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  • Lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material, preparation method thereof and lithium ion battery
  • Lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material, preparation method thereof and lithium ion battery
  • Lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0037] A preparation method of a lithium iron phosphate-cobalt lithium iron phosphate core-shell structure composite cathode material, comprising the following steps:

[0038] Step 1, 63 parts of LiOH·H 2 O was dissolved in 400 parts of deionized water to prepare lithium hydroxide solution, and 139 parts of FeSO 4 ·7H 2 O is dissolved in 400 parts of deionized water to prepare ferrous sulfate solution, and 58 parts by mass percent of H 3 PO 4 Add 200 parts of deionized water to prepare a phosphoric acid solution; first pour the phosphoric acid solution into 667 parts of PEG400, stir and mix evenly, and slowly add lithium hydroxide solution and ferrous sulfate solution under stirring to form a lithium iron phosphate precursor solution , and then the lithium iron phosphate precursor solution was transferred to an ultrasonic chemical reactor, under the condition of a reaction temperature of 160 ° C, microwave heating was used for 5 min, and the obtained precipitate was taken o...

Embodiment 2

[0046] A preparation method of a lithium iron phosphate-cobalt lithium iron phosphate core-shell structure composite cathode material, comprising the following steps:

[0047] Step 1, 63 parts of LiOH·H 2 O was dissolved in 400 parts of deionized water to prepare lithium hydroxide solution, and 139 parts of FeSO 4 ·7H 2 O is dissolved in 400 parts of deionized water to prepare ferrous sulfate solution, and 58 parts by mass percent of H 3 PO 4 Add 200 parts of deionized water to prepare a phosphoric acid solution; first pour the phosphoric acid solution into 667 parts of PEG400, stir and mix evenly, and slowly add lithium hydroxide solution and ferrous sulfate solution under stirring to form a lithium iron phosphate precursor solution , and then the lithium iron phosphate precursor solution was transferred to an ultrasonic chemical reactor, under the condition of a reaction temperature of 200 ° C, microwave heating was used for 10 min, and the obtained precipitate was taken ...

Embodiment 3

[0055] A preparation method of a lithium iron phosphate-cobalt lithium iron phosphate core-shell structure composite cathode material, comprising the following steps:

[0056] Step 1, 63 parts of LiOH·H 2 O was dissolved in 400 parts of deionized water to prepare lithium hydroxide solution, and 139 parts of FeSO 4 ·7H 2 O is dissolved in 400 parts of deionized water to prepare ferrous sulfate solution, and 58 parts by mass percent of H 3 PO 4Add 200 parts of deionized water to prepare a phosphoric acid solution; first pour the phosphoric acid solution into 667 parts of PEG400, stir and mix evenly, and slowly add lithium hydroxide solution and ferrous sulfate solution under stirring to form a lithium iron phosphate precursor solution , and then the lithium iron phosphate precursor solution was transferred to an ultrasonic chemical reactor, under the condition of a reaction temperature of 200 ° C, microwave heating was used for 10 min, and the obtained precipitate was filtere...

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Abstract

The invention discloses a lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material, a preparation method thereof and a lithium ion battery. The preparation method includes the steps that a formed lithium iron phosphate precursor solution is transferred into an ultrasonic chemical reactor to be processed through microwave heating, and a lithium iron phosphate core material is obtained; a formed lithium iron cobalt phosphate shell material precursor solution is transferred into the ultrasonic chemical reactor to be processed through microwave heating, the surface of the lithium iron phosphate core material is evenly wrapped by the lithium iron cobalt phosphate shell material, an intermediate product is obtained and subjected to centrifugal washing, drying and carbon coating, and the composite cathode material is obtained. The prepared lithium iron phosphate-lithium iron cobalt phosphate core-shell structure composite cathode material has good electrochemical properties and is hopefully used in the power battery field.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a lithium iron phosphate-lithium cobalt iron phosphate core-shell structure composite positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, lithium-ion batteries are widely used in various electronic devices, electric bicycles, and electric vehicles. However, lithium cobalt oxide, the cathode active material of traditional lithium-ion batteries, cannot be widely used in electric vehicle batteries due to its high cost and poor safety performance. The olivine-type lithium iron phosphate has the characteristics of abundant resources, environmental friendliness, and covalent bonds of phosphate radicals can provide it with good chemical stability and safety. It is considered to be the preferred cathode material for a new generation of lithium-ion batteries. However, the low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58H01M10/0525
CPCH01M4/1397H01M4/58H01M10/0525Y02E60/10
Inventor 许振海郑融陈均志郑小鹏王晓丽
Owner 郑州百成新能源科技有限公司
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